Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6751d406743537…

MALICIOUS

PDF

70.3 KB Created: 2021-03-16 04:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96924c32839f07984f5cb591d515f3a2 SHA-1: f155bf92b42406542c9866748db007d8820d26fa SHA-256: 3a6751d406743537abf71c0ef13306bea620456a0a020694939f485583809563
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure for 'worksheet answers', directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/wix?keyword=practica+de+los+adjetivos+posesivos+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/befozaxulot/hdiciaT/extreme_landings_gameplay.pdfIn PDF document text
    • https://tawisowa.weebly.com/uploads/1/3/5/3/135315305/zizulawafane-lurukudi-kobasifovakediz.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/b52238850b.pdfIn PDF document text
    • http://desokore.medianewsonline.com/69487559124.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/eicnErx/chess_openings_explained_book.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/395bdd636.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/3226679.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/8269f.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/Djhjghd/elementor_single_blog_post_template.pdfIn PDF document text
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/2928063.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/fiX8jha/real_3d_basketball_full_game_replays.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_9fc95b5715c845809791e9a1e10ccd24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/antonyms_exercises_with_answers_for_grade_6.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_5c8be9bfb30d4e2883ca99102580f46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/34172352041.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_c2ee40975e6140ec9f2ff69c125222df.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_5eca0ee007a24b5e8dfe21144a633a88.pdf?index=trueIn PDF document text
    • http://pozijawikubinun.myartsonline.com/87862847432.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_09995980802344bdbe52e1eb8b6d15ed.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 5456 bytes
SHA-256: cf3e43b4fc91e3d37e5a4ecf854d96b9279e3be8e08e2f04063bb410b27b178a
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 11568 bytes
SHA-256: a8f4d53ed0be244699ed62508f38b27b7a335e42f0a6d0eb2208dda89cbec429

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